Malicious PDF — malware analysis report

Static analysis result for SHA-256 83301479913e8ed0…

MALICIOUS

PDF

41.7 KB Created: 2020-11-01 19:48:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 495f5ed44c2014d7b199bd35e5055096 SHA-1: 466e293f5fe3fc5a3b754cd0a60353ce61b1c7b2 SHA-256: 83301479913e8ed064447cb27a417343c66196f0f630e5748a31b50e25b0cfcf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of numerous external PDF links suggests a link farm or SEO manipulation tactic to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/123?keyword=cisco+ospf+design+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379032/normal_5f8f970b4ad85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_5f88abf9219b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378383/normal_5f98e0427775d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415767/normal_5f959f2aa9caf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379726/normal_5f911b1d0ef6f.pdfIn PDF document text
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/25796.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/90760629103.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/kufururatujefinolazebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cde3eb8c-4bdd-43df-add7-356a3a891fba/not_for_the_life_of_me_sheet_music_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/mowatibomuposuwe.pdfIn PDF document text
    • https://s3.amazonaws.com/xebareto/alcatel_one_touch_pop_icon_user_guide.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6413 4888 bytes
SHA-256: f5fcd286e14c3df3d35817392f257ec3653b18b00dfe5d81e3949df30aeb2924
font_01_sfnt_off000074d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74D5 11468 bytes
SHA-256: 5a7185ca24a209328e1b40613085e0cb63eb7b45ebb81acdda1a2807547d9e2d

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